This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How are hydrogen isotopes used to infer polar temperature records? What will be an ideal ... (Read 52 times)

mwit1967

  • Hero Member
  • *****
  • Posts: 501
on: Jul 14, 2018
How are hydrogen isotopes used to infer polar temperature records?
 
  What will be an ideal response?

Question 2

What are thought to be the primary causes of this increase?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Awesome

  • Sr. Member
  • ****
  • Posts: 280
Reply #1 on: Jul 14, 2018
Answer to Question 1

Ice cores can be used to estimate past surface temperatures by looking at oxygen or hydrogen isotopes. By analyzing the isotopic composition of frozen water-ice in polar ice cores, we can learn something about the local temperature at the time the ice formed. Warmer water temperatures speed up the evaporation rates of both H2O and HDO. HDO represents water molecules that contain deuterium. Warmer temperatures correspond to a higher HDO content in the snow that falls over Antarctica and in the ice that forms from the snow.

Answer to Question 2

Apparently, humans have been responsible for the entire 39 increase in atmospheric CO2 concentration over the past two centuries. Deforestation of North America in the 19th century contributed to the initial rise, and then fossil fuel burning and tropical deforestration contributed after that.


mwit1967

  • Member
  • Posts: 501
Reply 2 on: Jul 14, 2018
Thanks for the timely response, appreciate it

upturnedfurball

  • Member
  • Posts: 334
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Organization of traditional source records Organization of traditional source records
Using an ice bath to test the fuel temperature sensor. Using an ice bath to test the fuel temperature sensor.
Nonlinear increase in saturation vapor pressure with increase in temperature. Nonlinear increase in saturation vapor pressure with increase in temperature.
Controls of Temperature Controls of Temperature
Temperature Regulation by the Hypothalamus Temperature Regulation by the Hypothalamus
Video: Dendrite Animation

For a complete list of videos, visit our video library